CABLE and Wireless Communications (CWC), the UK's biggest and newest cable telephone and television group, is likely to float a 14.7% stake in London and New York on Monday.

The flotation, which is not big enough to propel the new group into the FTSE, has been expected since CWC was formed in 1996 by merging the Mercury unit of Cable and Wireless with the three British cable TV units of NYNEX Corporation and Bell Canada.

CWC confirmed after the market closed that more than 95% of the North American investors had accepted share offers in the new company.

A partial flotation was expected immediately after the offer closed. ''The management are pretty confident that dealings will begin on Monday,'' a company spokeswoman said.

She said a few details remained to be finalised and added CWC would confirm the start of trade on Monday.

Analysts, who are keen to see the market value the new company, expect CWC's shares to begin trading at 1.3pm on Monday to coincide with the opening in New York. After the merger, there will be only one brand name - Cable and Wireless -and a huge advertising campaign is planned to ensure the name wins public recognition.

CWC will provide a broad range of local, national and international voice and data services and, in some regions, multichannel TV and internet computer services.

Despite bringing together cable TV groups NYNEX CableComms, Bell Cablemedia and Videotron, CWC's core business will be the telephony provided by Mercury. It will be BT's main rival.

But with initially only 1.1 million residential telecom and 80,000 business customers, compared to BT's 20.5 million residential and seven million business clients, some analysts say the new company will only pose a serious threat to BT in the middle of the next century.

''I don't see CWC as a threat to BT in the short and medium term,'' said Oliver Ehrenberg, telecoms analyst at Robert Fleming.